Sewing-machine loop-taker mechanism.



,agay

@chine is constructed rom Whd fises ih@ m'emngng tubuffe hallo?" hea/5.I he base l is disha' 5 amending longiits for- K begaf-actuatd por-M911wl 21317. Themawmsd #and Wth @y provided A y the strap 10 n A a' @i thepz man whose op ghi ang'es Wif'h he fcc/Los p0 ss Sonneced by means ofthe stud ,Qd and embaf by 2f, Siri y; at one am i2 the. aezfl @Yank-arm13 fixed upon dement cw Hb File Ed 'l5 which is embraced .m im boss mtits my stucvp of th@ collar 3 9 secured npon the reciprocatingneedle-bar 20 onrnaled in the bracketarm head 4- in the usual manner. asrepresented in fthe drawings, the' needle-bar carries its lower end themultiple needle-clamp 2l provided with the usual sockets in which arevsecured by means of set-screws 22 the Shanks of the needles arranged inaline cross- Wise of me direction ot feed and*s'ubstana tiaily parallelwith the main-shaft 5.

Cooperating; with each of the needles is a looper which 1s shown in thedrawings constructed in separable blade'and shank portions, the blade 24'being provided et its ton Ward end with the usual thread-eye 25 andatits rearward end or heel with. the depending extension 26 formed with a,transverse groove il?, The shank portion 28 is in the form of a lintplate having; 'upon one face the trai ,use toiigne or rib 29 itted tothe groove- 22( of th tension 26 and a lateral stud 3() i .filth athread-guiding aperture d' adjacent the heel of the looper-blaoe. nlieshank portion is formed its lower end with a lateral flange from 'whichdepends thestnd 3l by which it` is secured apen the looper carrier, andthe blade portion is secured adjustably in position-upon the shank 28 bymeans ot a fastening screw 39; passing through an elongated aperture 33of .e extension tapped into the portion 28.

The point or the loope'i-blade is laterally o'set 'from alinement withthe body portion, as represented more particularly in Fig. 8, and itsup` fr edge is formed with a thread groove extending; 'from the end ofthe heel for' lynnd terminating in the conver; tace Athe blade adjacentthe aperture 25 at one end oit a transverse guide aperture 35. Thelooper-blade with its extension is in practice struck np from a sheetmetal blank in order to be cheaply constructed in various Shapes andsizesthat are required for diierent stitchingF conditions, the diterentvarieties of bla le portion being interchangeable with a. uniformpattern of shank portion. By this means, not only is the construction ofthe looper facilitated, but a machine litted for one class et stitchingmay be readily changed for other Work and at a much smaller expense thanwith loopers of the ordinary construction in which the blade and shankare "formed integral.

Each looper-shank stud issecured adjustably by means of a set-screw 3GWithin a socket in the cross member 37 of the loopen carrier 38consistingot an upwardly extend ing; arm provided with a. 'perforatedboss or sleeve 39 and with a lateral extension 40 terminating' in ahall-stud 4l. The sleeve 39 is adapted to of a supporting fulorum-p1ndisposed substantially parallel with. the main-shaft and provided at theI rock and slide cndwise upon the reduced Dertien 42 opposite ends withthe enlarged l'ccentrically disposed portions 43 and 44, the latter ofwhich is secured removably to the :body of the tulcrum-pin torconvenience in as` sembling the parts and both of which are mounted insuitable bearings of the base l, as indicated in Fig. l.. T he ball-studel is embraced by a strap l5 of the pitman-lever 46 having at itsopposite end the integral lower section 47 of a strap having the capsection 48 and embracing the inclined looper-actueting crank 6, the axisof which is inclined to, but embraced within a plane arallel with andspaced from, the axis of tiie shaft 5, as will be clear from aninspection of Figs. 5, 6 and-7. The strap sectionse'? and .48 areprovided with the perforated lugs 47 and 48 adapted to be securedtogether by means of the screws 49. These lugs are so placed that eachof the strap sections projects at one end beyond ,the other and intocontact with one ot' the thrust 'lianges 50 disposed at the oppositeends ot .the inclined crank 6 and provided with vlaterally projectingrims 5l slightly overhanging the crank 6 to afford a sur'- ronnding oilcavity Whosel walls may be slightly undercut for better retaining asupply of oil. The screw-receiving apertures of the lugs 48 are ofelongated form so as to provide for relative endvvise adjustment of thestrap sections to take up Wear.

ln the operation of thc machine, the crank t3 constitutes an actuatingelement whose rotary movements are transmitted through the member 26acting as a pitman to the lateral arm 40 of the looper-carrier to impartrocking movements to the latter upon the ful- Crum-pin 42; While Saidrotary movements are transmitted through said member 46 acting as avbratory lever to impart bodily lateral movements to the looper-carrierendwisc of the supportingr fulcrnm-pin 42. The resultant movementimparted by the actuat ing element 6 to the loopcr-carrier mounted landconnected therewith as described is such as to cause the looper pointsto traverse elliptical paths substantially such as that shown in dottedlines in Fig. 11. As represented in Figs. 6 and 7, the crank 6- is sodisposed that its axis is inclined relatively to the axis of shaft 5 andalso is otl'sct therefrom so that the axes of the shaft and the crank do.not intersect, which causes the progressive. sidewise movement of thelooper-carrier during its oscillatory movements in such manner as tocause the looper pointe to traverse elliptical paths Whose axes aresubstantially parallel With the blades, and thus at an inclination withthe shaft 5 and the direction of feed, as represented diagrammaticallyin Figll in which the dotted ellipse designated :c indicates the path ofthe looper point, the arrow g/ the direction of endwise movement of thelooper llO extending lugs 97 of the frame-plate 93.'

7 8 embraced by a strap 79 `provided with a v transverse erforated boss80 adapted to receive the s iding pin 81 mountedv in theA lateral arm 82of the rocking vframe sustained by lthe'fulcrum-piiiiSS and providedwith upright arms'Si upon' which is pivotally mounted by means of thepivtal pin 85 the feed-bar 86 to which'is'secured the feed-dog 87. Thefeed-bar 86 is formed'with the inclined lateral arm 88 formed with asocket 89 to receive the slide-pin 90 which is provided with a strap 91embracing the iteedlift eccentric 92 also secured upon the main- 'shafhAs will be observed, the eccentric 7 8 imparts to the feed-do throughthe described connections operative movements at right angles to themain-shaft, while the eccentric 92 imparts the usual rising and fallingmovements to the feed-dog. l

As represented in Figs. land 2, above the base 1 is arranged asupporting frame-plate 93 having secured thereon the fiat bar 94 formedwith the tongue 95 extending lengthwise thereof to which is iitted therearward portion of the throat-plate section 96 whose forward portionrests upon the upwardly The frame-plate is providedin'its forwardportion with depending bearing lugs 98 in which is mounted the rod 99having adjustably secured thereto intermediate the lugs v 97 the blocks100 which are disposed below the looper paths and are formed withneedleguiding notches 101 to receive the pointed extremities ot' theneedles 23.

l Mounted within the head i oiE the bracketarm is the usual presser-bar102 having secured to its lower end the shank 103 of the compensatingpresser-toot which is shown provided with the independently movablefoot-plates 104C opposed to the feed-dog.

The u er thread-handling means corn'-v prise the several tension devices105 through which the several needle-threads s are led' from the sourceof supply and thence throughtheir respective guide-eyes 106 of theangular plate 107' secured to the arm 3 from which they are passedthrough their respectiye eyes 108 of the take-up arm 109 secured to andcarried by the needle-bar link 17, over the rigid controlling arm 110and through the guide-eyes lll of the bent pin 112 secured in the top ofthe needle-bar to" the respective needles.

n the operation of the machine, each needle descends and in its initialrising movement throws out its thread-loop which is entered by the pointof its respective'looper in the initial operative movement of thelatter. During this looper movement, the looper-carrier guide-eye 58moves outwardly and the `bontroller-ariii eyes 56 move inwardlyrlilatively to the frontend of the machine ,iso as to approachalinen'ient with the iXed'thread-eye 63, thus giving up slack theneedles,

in the ower thread to compensate for the advanc of the looper.

The loopers substantially endwise movement causes the needle-thread loopto slip along its blade without unnecessary distention, the sidewisemovement of the looper being only such as to permit the return of itsblade upon the opposite side of the needla-path.

As the looper performs its retrograde movement, the thread-controllingelements 58 and 56 perform thread-drawingfmovements opposite to thethread-slackening movements previously described, thereby maintainingthe lower thread taut between the looper point and the needle apertureof the throat-plate to insure the passage of the needle-point for asucceeding stitch between such strand of the lower thread and thev formachines employing a plurality of needles .and cooperating loopers forforming simultaneously several parallel lines of stitching. Heretoforeit has been customary to set the several needles in a line inclined tothe direction of feed and to rock the cooperating loopers in planes atright angles with the direction of feed. By the arrangement describedthe looper-thread was led around the needle-blade in a substantiallyU-shaped bend or loop whose parallel limbs were embraced by theneedle-thread loop,

and the latter could be readily set upon the lower face of the fabricwithout undue strain upon the needle-thread.

Such arrangement of the stitch-forming mechanism had the seriousdisadvantage of beginning the parallel seams in a line at an obliqueangle with the direction of feed, so that the seams would never beginnor end parallel wit'h the extremities oi the ordinary piece of work,making it necessary to have some of the seams terminate short of theextremity or others of the seams overrun the end of the work, which incertain-cases was impracticable. According tothe present improvement,the needles are arranged in a line at right angles tothe direction offeed so as to overcome the objection. re-` erred to.

' According to the present arrangement-of posed and reciprocatedparallel with the di.-

if the looper-blades-were disiso , along ethe'f face Gi' "che Mme i ingneedla-hra, of the el' a with 1 culty bei drawn up, and veli; tigxtteman whim the b'eaking of th@ theaia. the present invembona the 90 withher bfues m1 {mge recton of feed and mceve movements Wthniai econ offeed of such ch rffslltant mofements of h@ 00 vperformed in substanalyal embracing the respecfv@ i l 11m Snape 'm ends of its advance movemenas o "ne z" Ul amversia had l Wou conta@ Wl ich@ medrwem and fesis, 0 me@mem s. ment of the ae ai@ Y ae bhw Viding thread-housing @weve upperedge of "cha impe?? d co; is maintained bet-Ween 'h d1e-thread los@ w as"L0 be injurious engagement W?. he throughou the siichmining cyce.

,She @L @he thread-gfoove S@ being dosed my ih@ thread t is ed i@ meWork 11i n u the forwad end of such groove "le passmg througn me beam,me XK u.;

of looper represen'fd 1m @i @mi im?" L5- 12? n cclmeclon imm 'me pamMovement han@ by mason nf its blade inclined to the direction of feedrier for impartingI to the looper operative movements transversely ofthe Work-support and in a 'substantially elliptical path having its axesinclined to the direction of feed.

3. En a serving machine, the combination with a work-support and feedingmechanisnl, ot1 stiteh-forming mechanism includ ing a looper-carriermounted to oscillate transversely of the Work-support and upon an axisat right angles with the direction of feed, e looper sustained by saidcar 'ier with andactuating means connected Witlil said crrler andadapted to impart to the looper operative movements in a substantiallyelliptical path having its axis inclined to the direction of feed.,

4:. A sewing machine looper mechanism comprising an endwise and sidewisemovable looper, a carrier therefor, an actuating shaft provided with aninclined crank having its axis in non-intersecting relation with that ofsaid shaft, and an operative connection between said crank andlooper-carrier.

5.. A sewing machine looper mechanism comprising a looper, a carriertherefor, a supporting ulcrum providing),1 a fixed axis for said,carrier upon which it isadapted to perforrnboth rocking and bodilylaten? movements, an actuating shaft provided with an inclined crank,and a pitmandever having a strap embracing said crank and a pivotalconnection Witlisaid carrier eccentric to said supporting ulcrum..

6. A. sewing machine looper mechanism 'comprising a looser, a carriertherefor, a

fixed supporting ulcrum for said carrier relative to which it is adaptedto perform both rocking and bodily lateral movements, an actuating;shaft provided with an inclined crank, and a pitman-lever having a strapembracing said crank and a pivotal connection with said carrieradjustable to- Ward and from said slipporting fnlcrnm.

7. A sewing machine looper mechanism comprising a looper, a carriertherefor, ad support upon which said carrier has rocking; and bodilylateral movements upon a tilted axis, an actuating shaft provided withan inclined crank, and a pitman-lev'er having a, `strap embracing saidcrank and a pivotal connection with said carrier eccentric to saidairis'o movement.

8. n a sewing machine, the combination with a work-plate and feedingmecbanism, of Stitch-forming mechanism comprising a plurality ofreciprocating needles arranged in a line lperpendicular to the directionof feed, vva plurality of looperseach movable transversely of thework-plate and coperating with one of said needles and having its vbladearranged at an acute angle with they .direction of feed, and actuating;#means for imparting `to said loopers endivise anisnroperating: in avlc-plate a direcn tion crossivise of said L, ci' stitcb 'foriningincclniniszn coniipia i ity of reciprocating, needles a line parallelwith said oral fr oi'loopers eacli movable .ni y of the ivorlo plate andcooperating" n one et sazdnee dies and having its blade disposed 'at aninclination with said shaft, n carrier for said loopers, a supporting;'fulerum upon which. said carrier is adapted to oscillate and slide, andmeansr connected with said shaft i'or imperting,` to tbe ioooencarriercompound oscillatory and slidiin., L@temente which are mainly in tbedirection in 'vvliicli the loopen blades entend.4

i0. A, sewing niaciiine loopcr'nieciianism comprising; a leonor, carriertherefor, a ,supporting fuicrpirn for carrier relative to which it isada'nted to perform rocking and endvvise movements, an actuating shaftprovided with an inclined crank having thrust flanges at tbe oppositeends, and a pitnian-iever having; a pivotal connection with said carriereccentric to the sapporo ing; olcrum and a strap embracing said crankand termed in tivo separable parts each projecting; endwise beyond theother et one end and adapted to rest against tlie adjacent .thrust Hanneof said crank.

11. A sewing machine looper mechanism comprising a loopen, a carriertherefor, a supporting; inlcrun 4for said carrier relative to which itis adapted toperforin botti rockingt and endvfise m veinents., anactuating' shaft provided 'with an Ainclined crank havingr at olieopposite ends thrust danses` with riins over-hanging said crank, and apitmandevcry having' a pivotal connection with said carrier eccentric tothe supporting; fulcruin'j and strap embracing said crank and formed intwo senarabie parte each projecting endiv'isc bevond tbe other at oneend and adapted to rest against the adjacent thrust tiang'e of saidcrank.

l2.A A sewing machine looper mechanism composing alf3-oper, a carriertherefor, a l siipporting;r fulcruni upon which said carrier is adaptedto' perform rocking movements, an actuating shaft and a rotary actuatingelement thereon for said loopcr, an operative connection between saidelement and said carrier, and means operative independ-f ently of saidactuating shaft `for shifting said supporting 'fulcruzn toward and fromsaid actuating` element,

i3. A sewing machine looper mechanism comprising .a iooper, carriertherefor, a

ico.

comprising, a loop'er, a carrier therefor, a

supportino fulc'rum upon which said earrier is aoapted to Yperform.rocking Inovements, an actuating shaft, permanent operative connectionbetween said shaft and carrier, and means for retracting said carrierfrom normal operative position in a direc tion transverse to the axis ofsaid fnlcrum.

25. ln combination, a .Jooper-carrier, a looper, a looper-blade, meansfor securing the looper upon said carrier in different an guiarrelations therewith, and means vvhereby the looper-blade may be adjustedlengthwise relatively to said carrier independently of said securingmeans.

26. A sewing machine looper comprising shank and blade portionsseparable from each other, and means for securing them together.

Q7. A sewing machine looper comprising a shank portion provided with athread-eye, an eye-pointed blade portion se arable therefrom, and meansfor securing em together. 28. yA sewing machine looper comprising ashank portion, a blade portion, and means for securing the blade portionadjustably lengthwise of the blade upon the shank por- 29. A sewingmachine looper comprising a shank portionprovided with a thread-eye andwith a transverse tongue, an eye-pointed blade portion having a channelfitted to said tongue of the shank portion, and means for securing saidportions together adjustably lengthwise of said tongue.

30. A sewing machine looper comprising inatteso a shank portion and ablade separable therefrontend of substantially 'Hat cross-sectiand'p'rovided in one edge with a longitu inally extending thread-housinggroove terminating in the side-t`ace of the beak from which the threadis delivered. 31.. A. sewing machine looper comprising a shank portionand an eye-pointed blade separable therefrom with the pointed extremitylaterally odset, saidr blade being formed in its upper edgev with athreadroove terminating in the convex face adjacent/saidv eye in atransverse threading aperture.

32. A sewing machine'comprising, in combination, a frame, aWork-support, a reciprocating needle; an.oscillating looper, actuatingmeans sfor imparting reciprocatory movements to said needlev and' loopseizing and sidewise movements to said looper, shiftable means forlocking said' actuating means, tand means carried by said frame andoperatively connected with said shiftable means for shifting said looperto a po sition for convenience in threading.

33. In a sewing machine, a frame, in cornbination,4 a main-shaft, areciprocating needie, a movable looper cooperating with said needle, apivoted looperisupport, actuating;` va

connections between said niain-shaitv and said looper support, meanswhereby said looper support may be moved from normal to' abnormalposition, shiftable means for so moving said looper support, andconnections between said shitable means and said main-shaft acting tolock the latter against rotation when said looper support is moid toabnormal position.

ln testimony whereof, l name to this specication, in the presence of twosubscribing witnesses.

l annnnr naanrson'nn' von. 7

Witnesses: I

HENRY J. Mmes, HENRY A. KORNEMANN, Jr.

have signed @e

